20 March 2026
The UK at a Turning Point for Fusion
The United Kingdom stands at a pivotal moment in its energy transition. With over £2.5 billion committed to fusion and a clear pathway to commercialisation through programmes such as STEP, the focus has shifted from scientific leadership to industrial delivery. The challenge is now execution—delivering complex infrastructure safely, efficiently and at scale. This is where Assystem brings distinctive value.
Assystem’s Nuclear and Fusion Delivery Expertise
For more than 60 years, Assystem has supported the development, construction and commissioning of nuclear power programmes worldwide. This legacy is directly applicable to fusion. The UK’s strategy highlights the need for systems integration, robust supply chains and delivery certainty —all areas where Assystem has deep expertise as a leading independent nuclear engineering company.
Fusion is fundamentally an engineering and programme management challenge. It requires coordinating complex systems, managing interfaces across multiple stakeholders, and ensuring performance, cost and schedule discipline over long timeframes. Assystem’s integrated project management offer—covering governance, project controls, contract and commercial management, construction supervision and commissioning—provides a turnkey approach to delivering such mega-projects . Its ability to combine these capabilities with digital tools, data-driven decision-making and a “single source of truth” approach enables better risk anticipation, cost control and delivery performance.
At the same time, Assystem is an established fusion engineering partner. With nearly 20 years’ experience on programmes such as ITER, and active involvement in the UK through UKAEA, STEP and private developers, it bridges the gap between research and industrialisation. Its expertise in tritium engineering, nuclear safety, remote handling and systems integration aligns directly with the UK’s technical priorities.
Strategic Influence and Ecosystem Leadership
Beyond delivery, Assystem has played a strategic role in shaping the UK fusion ecosystem. It was instrumental in establishing the Fusion Industry Taskforce (FIT), creating a structured dialogue between government, industry and the supply chain. This has helped align policy with industrial realities and strengthen the UK’s position as a destination for fusion investment.
Assystem also contributed early thought leadership through its 2021 Fusion Report, which highlighted the need for coordinated industrial strategy, supply chain development and private sector engagement—principles now embedded in the UK’s national fusion strategy. This reinforces its role not only as a delivery partner, but as a long-term strategic contributor.
Digital Innovation and Global Strength Supporting the UK
Digital engineering is another key differentiator. The UK’s emphasis on AI, modelling and advanced simulation reflects the importance of data-driven delivery . Assystem integrates model-based systems engineering, digital twins and advanced project portfolio management tools to enhance visibility, improve coordination and support faster, more reliable decision-making across complex programmes.
Crucially, Assystem combines global reach with strong UK presence. Its understanding of UK regulatory frameworks, alongside international experience, enables it to support national programmes while bringing global best practice. Its capacity to mobilise multidisciplinary teams and coordinate complex supply chains directly supports the UK’s ambition to build a competitive domestic fusion industry.
Fusion represents a generational opportunity to deliver clean, secure energy while driving economic growth. Realising this ambition will depend on disciplined engineering, robust project management and effective collaboration.
In this context, Assystem’s added value is clear: combining six decades of nuclear expertise, proven fusion capability, advanced project management and strategic leadership to help the UK turn fusion ambition into industrial reality.
